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ProblemRastrigin contains a method that uses a Solution to calculate a value.
It can get this solution by calling the getSolution() method which is defined in I_SolutionCarrier and implemented by Actor.

Now I'd like to have a sort function in the class ProblemRastrigin that uses the getSolution() method to sort a LinkedList of actors. In the future however, different types of agents will carry a solution and thus the getSolution() method will be implemented in the Agent class.

Therefore I'd like the sort method in problemRastrigin to be Sort(LinkedList<I_SolutionCarrier>) instead of sort(LinkedList<Actor>). In principle this works fine, but for this to work I have to cast all elements of a LinkedList<Actor> to get a LinkedList<I_SolutionCarrier> before I can sort.